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Cheap flights from St. Louis to Sofia from $778

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Sofia departing on 8/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Sofia

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
11:51 am - 2:00 pm
STL
-
SOF
18h 09m
2 stops
Multiple Airlines Logo
7:00 am - 11:37 pm
SOF
-
STL
24h 37m
2 stops
$778Multiple Airlines
Mon, Aug 10 - Wed, Aug 19
United Airlines Logo
8:43 am - 12:10 pm
STL
-
SOF
19h 27m
2 stops
United Airlines Logo
6:10 am - 11:50 pm
SOF
-
STL
25h 40m
2 stops
$782United Airlines
Mon, Jul 27 - Thu, Aug 20
United Airlines Logo
3:30 pm - 1:05 pm
STL
-
SOF
13h 35m
1 stop
United Airlines Logo
6:10 am - 11:50 pm
SOF
-
STL
25h 40m
2 stops
$790United Airlines
Tue, Jul 28 - Thu, Aug 20
Multiple Airlines Logo
10:51 am - 2:00 pm
STL
-
SOF
19h 09m
2 stops
Multiple Airlines Logo
7:00 am - 6:00 pm
SOF
-
STL
19h 00m
2 stops
$812Multiple Airlines
Tue, Jul 28 - Wed, Aug 19
KLM Logo
10:51 am - 2:00 pm
STL
-
SOF
19h 09m
2 stops
KLM Logo
7:00 am - 6:00 pm
SOF
-
STL
19h 00m
2 stops
$817KLM
Wed, Jul 29 - Wed, Aug 19
United Airlines Logo
8:43 am - 12:10 pm
STL
-
SOF
19h 27m
2 stops
United Airlines Logo
6:20 am - 10:16 pm
SOF
-
STL
23h 56m
2 stops
$830United Airlines
Mon, Jul 27 - Sat, Aug 22
United Airlines Logo
4:48 pm - 11:15 pm
STL
-
SOF
22h 27m
2 stops
United Airlines Logo
6:10 am - 11:50 pm
SOF
-
STL
25h 40m
2 stops
$832United Airlines
Fri, Jul 31 - Thu, Aug 20
United Airlines Logo
9:00 am - 11:15 pm
STL
-
SOF
30h 15m
2 stops
United Airlines Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$838United Airlines
Wed, Sep 9 - Wed, Sep 16
United Airlines Logo
3:30 pm - 10:30 pm
STL
-
SOF
23h 00m
1 stop
United Airlines Logo
6:10 am - 11:50 pm
SOF
-
STL
25h 40m
2 stops
$840United Airlines
Fri, Aug 7 - Thu, Aug 20
United Airlines Logo
4:40 pm - 11:15 pm
STL
-
SOF
22h 35m
2 stops
United Airlines Logo
6:20 am - 6:41 pm
SOF
-
STL
20h 21m
2 stops
$842United Airlines
Wed, Sep 9 - Wed, Sep 16

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United Airlines flights from St. Louis to Sofia

Our best United Airlines deals on St. Louis to Sofia flight tickets
United Airlines
Aug 2
STL5:33 pmLambert-St Louis
21h 42m
2 stops
SOF11:15 pmSofia
Aug 20
SOF6:30 amSofia
23h 46m
2 stops
STL10:16 pmLambert-St Louis
$781
United Airlines
Aug 11
STL1:24 pmLambert-St Louis
14h 46m
2 stops
SOF12:10 pmSofia
Aug 26
SOF6:10 amSofia
20h 46m
2 stops
STL6:56 pmLambert-St Louis
$782
United Airlines
Aug 4
STL3:30 pmLambert-St Louis
18h 30m
1 stop
SOF6:00 pmSofia
Aug 20
SOF6:30 amSofia
23h 46m
2 stops
STL10:16 pmLambert-St Louis
$788

KLM flights from St. Louis to Sofia

Our best KLM deals on St. Louis to Sofia flight tickets
KLM
Aug 5
STL1:22 pmLambert-St Louis
16h 38m
2 stops
SOF2:00 pmSofia
Aug 19
SOF7:00 amSofia
24h 37m
2 stops
STL11:37 pmLambert-St Louis
$783
KLM
Jul 29
STL10:51 amLambert-St Louis
19h 09m
2 stops
SOF2:00 pmSofia
Aug 19
SOF7:00 amSofia
19h 00m
2 stops
STL6:00 pmLambert-St Louis
$817
KLM
Aug 5
STL1:22 pmLambert-St Louis
16h 38m
2 stops
SOF2:00 pmSofia
Aug 22
SOF7:00 amSofia
19h 02m
2 stops
STL6:02 pmLambert-St Louis
$833

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Sofia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated April 29, 2026.
Use the filters below to find and compare flights from St. Louis to Sofia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Mon 8/10

11:51 am-2:00 pm

2 stops18h 09m

Sofia

Wed 8/19

7:00 am-11:37 pm

2 stops24h 37m

$778

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Mon 7/27

8:43 am-12:10 pm

2 stops19h 27m

Sofia

Thu 8/20

6:10 am-11:50 pm

2 stops25h 40m

$782

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Tue 7/28

3:30 pm-1:05 pm

1 stop13h 35m

Sofia

Thu 8/20

6:10 am-11:50 pm

2 stops25h 40m

$790
Quickest round-trip

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Tue 7/28

10:51 am-2:00 pm

2 stops19h 09m

Sofia

Wed 8/19

7:00 am-6:00 pm

2 stops19h 00m

$812

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 7/29

10:51 am-2:00 pm

2 stops19h 09m

Sofia

Wed 8/19

7:00 am-6:00 pm

2 stops19h 00m

$817

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Mon 7/27

8:43 am-12:10 pm

2 stops19h 27m

Sofia

Sat 8/22

6:20 am-10:16 pm

2 stops23h 56m

$830

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Fri 7/31

4:48 pm-11:15 pm

2 stops22h 27m

Sofia

Thu 8/20

6:10 am-11:50 pm

2 stops25h 40m

$832

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

9:00 am-11:15 pm

2 stops30h 15m

Sofia

Wed 9/16

6:20 am-1:25 pm

1 stop15h 05m

$838

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Fri 8/7

3:30 pm-10:30 pm

1 stop23h 00m

Sofia

Thu 8/20

6:10 am-11:50 pm

2 stops25h 40m

$840

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

4:40 pm-11:15 pm

2 stops22h 35m

Sofia

Wed 9/16

6:20 am-6:41 pm

2 stops20h 21m

$842

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Sofia from

How to get the cheapest flight ticket from St. Louis to Sofia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between St. Louis and Sofia?

What is the cheapest month to fly to Sofia?

The cheapest month to fly to Sofia from St. Louis is in October. Flight prices, which tend to average around $0, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of October, then book flights to Sofia from St. Louis during January instead. Flights to Sofia in January, while not as cheap as those in October, still average around $528.

How far in advance should I book a flight from St. Louis to Sofia?

You are more likely to see cheaper flights to Sofia from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Sofia for around $847 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sofia from St. Louis for as low as $746 on momondo.

Can stopping save me money on St. Louis to Sofia flights?

You could potentially save up to 39% on your flight if you consider stops on a St. Louis to Sofia flight.

When to book flights from St. Louis to Sofia

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Sofia according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Sofia (STL to SOF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Sofia

Fastest flight time

18h 09m

Direct flights

None
The fastest flight from St. Louis to Sofia takes 18h 09m
There are no direct flights from St. Louis to Sofia. There are no popular flight routes from St. Louis to Sofia.
Search flight deals

Frequently asked questions about flying from St. Louis to Sofia

  • How far is Lambert-St Louis to Sofia by plane?

    A flight from Lambert-St Louis to Sofia will travel around 5441.0 mi. 18h 09m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Sofia Airport?

    Prices for flights from Lambert-St Louis Airport to Sofia Airport are updated daily.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Sofia Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Sofia Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Sofia Airport.

  • What documentation or ID do you need to fly to Sofia Airport?

    The travel and health documents you'll need for your trip to Sofia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Sofia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from St. Louis to Sofia?

Best airlines flying from St. Louis to Sofia

Compare and see reviews for airlines that fly from St. Louis to Sofia with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $560Free CancellationRating
7.4
9,678 reviews
Search United Airlines flights
LufthansaPriceFrom $598Free CancellationRating
6.8
7,959 reviews
Search Lufthansa flights
Air CanadaPriceFrom $1,108Free CancellationRating
7.1
10,977 reviews
Search Air Canada flights

Traveling to a place near Sofia?

Book flights to Sofia if you plan to visit one of these locations
Bansko
Borovets
Velingrad
Sandanski

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Sofia?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Sofia. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to Sofia with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Sofia from St. Louis with this policy.

How can momondo help me find flights from St. Louis to Sofia?

Once all potential St. Louis to Sofia flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from St. Louis to Sofia right now. Can momondo alert me if prices change?

Price alerts on flights to Sofia from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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Fly your favorite airline to Sofia

Airlines are sorted and displayed according to clicks in the past 7 days on momondo
Lufthansa
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Air Canada